Timken numbers

[JPP]

I have a 29 and the AA numbers for inner cone bearing and cup are 1201 &1202 and the outer bearings and cup is 1216 &1217. Does anyone know the correct Timken numbers, apparently Mac's does not.

[Bob C]

AA-1201-AR = 1680, AA-1202-AR = 1620, AA-1216-AR = 1380, AA-1217-AR = 1328

Bob

[JPP]

Bob, thanks

[JPP]

Ok, so I ordered the AA1201 bearing or Timken 1680, and the bearing does not fit, it is too small. While my bearing is broken, the inner race of the aa1201 has the following markings, is AA 1201 M M different from AA1201 AR

[gunmetal 2]

don't know but could 1201-MM be 1201-Millemeters. Thank for the numbers Bob. What part of the truck does this go for, please I have a 1929 AA

[Bob C]

JPP, Are you sure you have a 1929 and not an early 1930?? Could you post a picture
of your front hub and drum.
The 30-34 bearing is BB-1201 (AA-1204-B) Timken 2788 ID 1.500 inches.
The 28-29 bearing is AA-1201-AR Timken 1680 ID 1.3125 inches

Bob

[JPP]

Bob, Thanks for the info. To be clear, I don't know if my front end is an early 30 or '29, but I will take a picture and post it. What I do know is that the picture of the bearing on this thread came off my truck and as you can see it is stamped aa1201. When I recently received the Timken 1680 replacement, the ID was snug but the OD was to small for my hub. Does that give you a clue.

[Bob C]

Does the 1620 race fit in the hub??

Bob

[JPP]

The race is too small for the hub.

[BrianT]

Hello John,
You have the correct hubs that came with the recall, so 30-31 bearings are correct, when you say the race is to small, by how much, if it is close then the broken race as probably worn the hub, I am sure your spindles are correct look for the AA cast in the part that's facing you in your pic.

[Bob C]

What is the number on the old inner race that was in the hub?

Bob

[JPP]

AA 1202.

[BrianT]

John,
Here are the OD measurements for inner race Timkin AA 1202 2.624 inches ----- outer race Timkin 1217 2.065 inches.

[tiredtruckrestorer]

JPP

First off, 30-31 bearings and races will not fit the hubs pictured. The spindles were again made larger for the heavier front axle that came out in January 1930. The kingpins were even heavier in these axles.

The hubs pictured were used on trucks built from Nov 1st, 1928 thru Dec 1929. Ford also issued a Service Bulletin on April 10, 1929 telling Dealers to replace the spindles, bearings, and hubs on trucks built before Nov 1st, 1928 with this style. These trucks previous used the standard A parts (A part numbers too) except for the hub for the AA wheels. Both styles of these spindles still used the Model A size kingpins. Not all the earlier trucks received the updated parts though because Ford instructed the Dealers to do this update as customers brought their trucks in for service. I just rebuilt the front end of a '29 that had all the original A parts in it yet.

The remains of the AA-1201 inner bearing cone would be the correct original bearing number for your hubs with corresponding AA-1202 inner cup. These numbers were changed to AA-1201-AR and AA-1202-AR when the 1930 change was made to even heavier spindles. The bearings are the same just the "AR" suffix was added. The new '30 hubs used numbers AA-1201-B and AA-1202-B respectively. Later the numbers changed to BB-1201 and BB-1202 when the '32 BB trucks came out. These bearings fit the '30 to '34 front ends.

Bob C was correct with his part numbers and modern Timken replacements. The Timken number 1620 should be the inner bearing cup for your hub. If this fits too loose in the hub then the hub wore from the race spinning in it. If it's not too bad you can roughen up the hub with a center punch. Just hammer lots of punch marks all around the area where the race sits in the hub. Put Locktite stud and bearing mount or equivalent on the race and drive it in. If the race still doesn't drive in with some resistance then it's time to replace the hub.

Keith

[BrianT]

Thanks Keith for the correction, -- I remember now in 2009 ordering the 30-31 bearings for my May 29 thinking the AR designation were the pre recall bearings, had to reorder, I did not fully understand what AR stood for.